Performance Analysis of Voltage Multiplier Coupled Cascaded Boost Converter With Solar PV Integration for DC Microgrid Application

The voltage gain of the quadratic boost converter (QBC) increases when the duty cycle is greater than 0.70. The Voltage Multiplier Coupled Quadratic Boost Converter (VM-QBC) is derived to increase the voltage gain by increasing the numerator part of the voltage gain equation. To improve the performance of the VM-QBC, a modified VM-QBC viz., Voltage Multiplier Coupled Cascaded Boost Converter (VM-CBC) is proposed in this paper. The continuous source current, utilization of two inductors, non-inverted output voltage, improved efficiency and common ground between the input source and the load are the key merits of the proposed VM-CBC. The operation of the proposed converters in continuous and discontinuous conduction modes is studied. The performance of the proposed converters is evaluated and compared to the performance of recently reported converters. The state-space models of the proposed converters are derived, and the significant transfer function's bode plots are examined. The experimental results of a 500 W, 50 kHz, 650 V, input supply with 48 V are reported. A PI controller for the VM-CBC is designed, and the closed-loop experimental results are presented. The simulation results of the integrated VM-CBC and 3φ inverter with solar PV are also presented. The P&O algorithm controlled VM-CBC ensures the maximum power taken from solar PV.